Nail extracting machine



June 12, 1962 R. L. SAlNlO I -NAIL EXTRACTING MACHINE Filed Dec. 5, 1958v INVENTOR 'RAINER LANNART SAINIO FIG.5

ATTORNEY United States Patent Ofifice 3,838,781 Patented June 12, 19623,038,701 NAIL EXTRACTING MACHINE Rainer Lannart Sainio, Oksasenkatu 1,Lappeenranta, Finland Filed Dec. 5, 1958, Ser. No. 778,533 2 Claims.(Cl. 254-18) This invention relates to machines for extracting nails.The removing of nails by hand from used boards has always beenconsidered to be a very ditlicult, costly and tedious operation. Theinvention has as an object the provision of an improved machine wherebynails may be most easily extracted.

According to this invention, a nail extracting machine is provided withtwo gripping jaws which are made to move upwards and downwards, one ofthe said gripping jaws being secured to a slider with reciprocatingmotion while the other one of the jaws is turna-bly mounted to the saidslider.

A feature of this invention is that, for pressing together the jaws andfor pulling down the slider and the means secured to it there isprovided a pressing rod or toggle, an end of which is provided with arounded cam surface pivotally mounted on said slider. The pressing rodis also pivotally coupled to a connecting rod by which the pressing rod,during the downward movement of the connecting rod, will first press theextracting jaws against another, while the said rounded cam surface ofthe pressing rod causes the slider to be pulled downwards thereby alsoforcing the pressing rod to move downwards.

The construction of the machine can be understood from the accompanyingdrawing, in which:

FIGURE 1 is a front view of the machine,

FIGURE 2 is a sid view of the machine of FIG. 1, and

FIGURE 3 is a sectional view of the top part of the machine, on enlargedscale, the jaws being in their top position just before closing.

The nail to be extracted is placed between jaws 18. The nail can be inany position, provided only that it projects slightly from the surfaceof the board (about 3 to 4 mm). The mechanism of the machine firstforces the clamping jaws to close firmly around the nail and thereafterdrags the nail out head first or point first. When the nail is grippedbetween the jaws 18, the connecting rod or lever 4, with the aid of thecrank shaft 3 and the toggle or pressing rod 10, operates to clamp thejaws together. Simultaneously a member 7 prevents the slider 8 frommoving downwards before the jaws 18 have properly gripped the nail.Thereafter the slider is pulled downwards by the crank shaft and bringsthe extracted nail with it. When the slider has reached its lowestposition, the jaws are opened immediately after the crank shaft startsto move upwards, by the action of a lug 14 and a jaw opening spring 12working in cooperation with the pressing rod 16. The position of thepressing rod allows the jaws to be open during their upward motion,whereby sufiicient time is given for positioning the nail between thejaws.

The base of the nail extracting machin consists of a structural steelframework 1 on which are mounted a power source 15 consisting of anelectric motor or an internal combustion engine, reduction means 20consisting of a suitable toothed wheel gearing or worm gearing, and theframe 2 of the machine. The rotation is converted into a reciprocatorymovement by means of the connecting rod 4 and the crank 3, and theslider 8 moves up and down in the track formed by the frame 2 and guide16. When the connecting rod moves upwards, it first forces the toggle l8upwards at an inclination and the spring 12, of the jaw mechanismreleases the thus pivotal member 9 to which one of the jaws 18 issecured, thus producing a gap of about 15-20 mm. between the two jaws.In the following work ing phase, the toggl 1d pulls the whole movableslider into its topmost position by means of the lug 14. In this phase,the slider is supported by the stop member 7 secured to the springs 6and the spring securing means 5. Springs 6 are stronger than spring 12so that the latter spring yields and permits toggle 10 to urge the jawstogether. Thus, when th connecting rod starts to pull downwards again,the pressing rod 10 is pivoted into a horizontal position so that itclamps the nail between the jaws 18. In the following phase, the slidermoves downwards overcoming members 7 and springs 6 so that the jaws dragthe nail out. The jaws drop the nail when the movement of the sliderchanges and the jaws open, letting the nail fall through an outletopening 17 in the frame 2 and further into a collecting container.During this movement, the member 7 turns upwards to an inclinedposition, thus allowing the slider to pass. A bracket 11 serves as asupport for the board while the nails are being introduced between thejaws.

What is claimed is:

1. A nail extracting machin comprising a guide, a slider slidable alongsaid guide, cooperating jaws on said slider, at least one of said jawsbeing pivotal on said slider whereby a nail can be grasped and releasedby said jaws, a toggle pivoted on said slider and including a camportion adjacent the pivotal jaw for pivoting the latter towards theother of the jaws, a spring on said slider and coupled to the pivotaljaw for urging the same away from the other jaw, a member pivoted tosaid guid and engaging said slider, with the slider at a first positionon said guide, for supporting the slider, a spring loading said memberwhereby the latter yieldingly engages said slider, the latter saidspring being stronger than the first said spring to provide foroperation of said jaws by said toggle, a lever pivotally connected tosaid toggle, and means to reciprocate said lever along said guide, saidmeans displacing said lever in one direction along said guide until saidslider is at said first position and engaged by said member, said meansthen reversing the direction of displacement of said lever firstly topivot said toggle against the action of the weaker spring and urge saidcam portion against the pivotal jaw and secondly to pull said sliderpast said member against the action of the stronger spring to complete aworking cycle.

2. A machine as claimed in claim 1 comprising a lug on said sliderlimiting pivotal movement of said toggle.

References (Iited in the file of this patent UNITED STATES PATENTS2,495,885 Blume Jan. 31, 1950 FOREIGN PATENTS 560,310 Great Britain Mar..29, 1944 78,605 Denmark Dec. 13, 1954

